The program to determine the given String is number or not

Program:

#include<stdio.h>

#include<conio.h>

#include<string,h>

#include<ctype.h>

main()

{

int i,flag=0,f=0,n=0;

char a[100],c;

do

{

flag=0,f=0;

printf("enter the string:");

scanf("%s",a);

n=strlen(a);

for(i=0;i<n;i++)

{

if(!isdigit(a[i]))

{

if(a[i]==".")

{

if(f==1)

{

flag==1;

}

f=1;

continue;

}

else

flag=1;

break;

}

}

if(flag==0&&f==0)

printf("\n the given string is %s is integer",a);

else

if(flag==0&&f==1)

printf("\n the given string %s is floating point",a);

else

printf("\n the given string %s is not a number",a);

printf("\n want to check another(y/n)");

scanf("%c",&c);

}

while(c='y'/c='n');

}